Eclogite trace in evolution of Late Cenozoic alkaline basalt volcanism on the southwestern flank of the Baikal Rift Zone: Geochemical features and geodynamic consequences

Eclogitized material from the oceanic lithosphere are the most likely source of alkaline basalt magmas in the formation of Late Cenozoic volcanic areas on the southwestern flank of the Baikal Rift Zone. Basaltic trachyandesites of the early stage of volcanism (Pg 3 2 ~ 28–23 Ma) are rich in high fie...

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Veröffentlicht in:Doklady earth sciences 2017-10, Vol.476 (2), p.1187-1192
Hauptverfasser: Perepelov, A. B., Kuzmin, M. I., Tsypukova, S. S., Demonterova, E. I., Ivanov, A. V., Shcherbakov, Yu. D., Puzankov, M. Yu, Odgerel, D., Bat-Ulzii, D.
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container_title Doklady earth sciences
container_volume 476
creator Perepelov, A. B.
Kuzmin, M. I.
Tsypukova, S. S.
Demonterova, E. I.
Ivanov, A. V.
Shcherbakov, Yu. D.
Puzankov, M. Yu
Odgerel, D.
Bat-Ulzii, D.
description Eclogitized material from the oceanic lithosphere are the most likely source of alkaline basalt magmas in the formation of Late Cenozoic volcanic areas on the southwestern flank of the Baikal Rift Zone. Basaltic trachyandesites of the early stage of volcanism (Pg 3 2 ~ 28–23 Ma) are rich in high field strength elements (HFSE), P 2 O 5 , F, Zn, Ga, Sr, Sn, and light rare earth elements (LREE); they are characterized by high values of the following ratios: Fe/Mn = 72–77, Sm/Yb = 7.7–8.5, Sr/Y = 57–63, and Ga/Sc = 2.1–2.3. At this stage, magmas are formed under conditions with a 2–8% degree of partial melting of the mantle substrate enriched with the material of the eclogite source (50–70%) (Cpx/Grt = 1.5–1.7). Basaltoid magmas of the final stage of volcanism (N 1 3 –N 2 1 ~ 6–4 Ma) are formed from melting (1.5–4%) of a less fertilized mantle (Cpx/Grt = 2.1–3.1, Fe/Mn = 62–71, Sm/Yb = 3.5–4.6, Sr/Y = 29–44, Ga/Sc = 1.0–1.4). The directed variations of the compositions of the successive basaltoid magmas, which were formed in the Late Cenozoic, create an “eclogite trace” in this area.
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B. ; Kuzmin, M. I. ; Tsypukova, S. S. ; Demonterova, E. I. ; Ivanov, A. V. ; Shcherbakov, Yu. D. ; Puzankov, M. Yu ; Odgerel, D. ; Bat-Ulzii, D.</creator><creatorcontrib>Perepelov, A. B. ; Kuzmin, M. I. ; Tsypukova, S. S. ; Demonterova, E. I. ; Ivanov, A. V. ; Shcherbakov, Yu. D. ; Puzankov, M. Yu ; Odgerel, D. ; Bat-Ulzii, D.</creatorcontrib><description>Eclogitized material from the oceanic lithosphere are the most likely source of alkaline basalt magmas in the formation of Late Cenozoic volcanic areas on the southwestern flank of the Baikal Rift Zone. Basaltic trachyandesites of the early stage of volcanism (Pg 3 2 ~ 28–23 Ma) are rich in high field strength elements (HFSE), P 2 O 5 , F, Zn, Ga, Sr, Sn, and light rare earth elements (LREE); they are characterized by high values of the following ratios: Fe/Mn = 72–77, Sm/Yb = 7.7–8.5, Sr/Y = 57–63, and Ga/Sc = 2.1–2.3. 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B.</au><au>Kuzmin, M. I.</au><au>Tsypukova, S. S.</au><au>Demonterova, E. I.</au><au>Ivanov, A. V.</au><au>Shcherbakov, Yu. D.</au><au>Puzankov, M. Yu</au><au>Odgerel, D.</au><au>Bat-Ulzii, D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Eclogite trace in evolution of Late Cenozoic alkaline basalt volcanism on the southwestern flank of the Baikal Rift Zone: Geochemical features and geodynamic consequences</atitle><jtitle>Doklady earth sciences</jtitle><stitle>Dokl. Earth Sc</stitle><date>2017-10-01</date><risdate>2017</risdate><volume>476</volume><issue>2</issue><spage>1187</spage><epage>1192</epage><pages>1187-1192</pages><issn>1028-334X</issn><eissn>1531-8354</eissn><abstract>Eclogitized material from the oceanic lithosphere are the most likely source of alkaline basalt magmas in the formation of Late Cenozoic volcanic areas on the southwestern flank of the Baikal Rift Zone. Basaltic trachyandesites of the early stage of volcanism (Pg 3 2 ~ 28–23 Ma) are rich in high field strength elements (HFSE), P 2 O 5 , F, Zn, Ga, Sr, Sn, and light rare earth elements (LREE); they are characterized by high values of the following ratios: Fe/Mn = 72–77, Sm/Yb = 7.7–8.5, Sr/Y = 57–63, and Ga/Sc = 2.1–2.3. At this stage, magmas are formed under conditions with a 2–8% degree of partial melting of the mantle substrate enriched with the material of the eclogite source (50–70%) (Cpx/Grt = 1.5–1.7). Basaltoid magmas of the final stage of volcanism (N 1 3 –N 2 1 ~ 6–4 Ma) are formed from melting (1.5–4%) of a less fertilized mantle (Cpx/Grt = 2.1–3.1, Fe/Mn = 62–71, Sm/Yb = 3.5–4.6, Sr/Y = 29–44, Ga/Sc = 1.0–1.4). The directed variations of the compositions of the successive basaltoid magmas, which were formed in the Late Cenozoic, create an “eclogite trace” in this area.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S1028334X1710018X</doi><tpages>6</tpages></addata></record>
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source SpringerNature Journals
subjects Alkalinity
Basalt
Cenozoic
Earth
Earth and Environmental Science
Earth Sciences
Eclogite
Evolution
Field strength
Gallium
Geochemistry
Iron
Lava
Lithosphere
Magma
Manganese
Mantle
Melting
Rare earth elements
Ratios
Rift zones
Volcanic activity
Volcanism
Volcanoes
Zinc
title Eclogite trace in evolution of Late Cenozoic alkaline basalt volcanism on the southwestern flank of the Baikal Rift Zone: Geochemical features and geodynamic consequences
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